High Pressure Phase Transition and Allied Behavior of Samarium Compounds
M. Singh a, A. Gour b and S. Singhc
aGovt. Post Graduate College, Ganjbasoda (M.P.), India
bGovt. Polytechnic College Physics Department, Harda, Indore Road (M.P.), India
cHigh Pressure Research Lab, Physics Department, Barkatuallah University, Bhopal (M.P.), India
Received: March 6, 2012; revised version: February 16, 2013; in final form: February 26, 2013
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A theoretical study of the phase transition of samarium monochalcogenides using three-body interaction potential model is carried out at high pressure. The three-body interaction potential includes long range Coulombic, three-body interaction forces and short range overlap repulsive forces operative up to next nearest neighbor ions. We have investigated phase transition pressures, volume collapses, elastic behavior, stability criteria and various thermo physical properties at various high pressure. The results found are well suited with available experimental data. In this paper third order elastic constants are also reported for the first time which helps in understanding the nature of interionic forces in ionic solids which paved the experimentalist to work in specific direction.

DOI: 10.12693/APhysPolA.123.709
PACS numbers: 61.50.Ks, 61.50.Lt, 61.66.-f, 62.20.-x